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<?php
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// $Id: multipage_form_example.module,v 1.6 2006/04/02 19:02:55 thehunmonkgroup Exp $
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/**
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* Implementation of hook_help().
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*/
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function multipage_form_example_help($section) {
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switch ($section) {
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case 'admin/modules#description':
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return t('An example module showing how to handle multipage forms in FAPI.');
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case 'node/add#multipage_form_example':
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return t('This will show you an example multipage form submission.');
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}
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}
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/**
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* Implementation of hook_menu().
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*/
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function multipage_form_example_menu($may_cache) {
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$items = array();
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if (!$may_cache) {
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$items[] = array('title' => t('multipage form example'),
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'path' => 'node/add/multipage_form_example',
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'access' => TRUE,
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);
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}
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return $items;
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}
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/**
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* Implementation of hook_access().
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*/
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function multipage_form_example_access($op, $node) {
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return TRUE;
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}
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/**
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* Implementation of hook_node_info().
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*/
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function multipage_form_example_node_info() {
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return array('multipage_form_example' => array('name' => t('multipage form example'), 'base' => 'multipage_form_example'));
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}
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/**
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* Implementation of hook_form() for multipage_form_example. We don't set ANY
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* #required attributes here - we leave that up to multipage_form_example_pre_render().
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*/
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function multipage_form_example_form(&$node) {
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$form = array();
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// 'checkboxes' elements are just ridiculously hard--i recommend just
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// using a bunch of individual checkbox elements instead.
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// I suspect that multiselects would also be pretty difficult...
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// Here's a new form element, which enables you to store hidden values
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// in an array. Check out the element definition functions at the bottom
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// if you want to use this in a module. Keys show up in the
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// $_POST/$form_values like:
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// $_POST['edit']['test_hidden_array']['n'] = 'north'
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// $form_values['test_hidden_array']['n'] = 'north'
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$form['test_hidden_array'] = array(
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'#type' => 'hidden_array',
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'#values' => array('n' => 'north', 'e' => 'east', 'w' => 'west', 's' => 'south', ),
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);
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// Helper for our multipage - does field switching, sets options
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// based on validated $form_values instead of $_POST, and so forth.
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$form['#pre_render'] = array('multipage_form_example_pre_render');
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// Title and body, page 1
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$form['title'] = array(
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'#type' => 'textfield',
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'#title' => t('Title'),
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'#default_value' => isset($node->title) ? $node->title : NULL,
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'#description' => t("Enter a title for your favorites section."),
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'#size' => 60,
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'#maxlength' => 128,
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'#required' => TRUE,
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);
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$form['body'] = array(
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'#type' => 'textarea',
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'#title' => t('Description'),
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'#default_value' => isset($node->body) ? $node->body : NULL,
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'#description' => t('Add any additional info about your favorites.'),
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'#rows' => 20,
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);
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// Person, page 2
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$form['person'] = array(
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'#type' => 'fieldset',
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'#title' => t('Your favorite person'),
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);
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$form['person']['fav_person'] = array(
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'#type' => 'textfield',
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'#title' => t('Name'),
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'#default_value' => isset($node->fav_person) ? $node->fav_person : NULL,
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'#description' => t('Enter their real name, or their code name if they like to fly stealth.'),
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'#required' => TRUE,
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);
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$form['person']['fav_person_desc'] = array(
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'#type' => 'textarea',
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'#title' => t('Description'),
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'#default_value' => isset($node->fav_person_desc) ? $node->fav_person_desc : NULL,
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'#description' => t('Juicy details go here...'),
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'#required' => TRUE,
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);
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$form['person']['fav_gummi'] = array(
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'#type' => 'checkbox',
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'#default_value' => isset($node->fav_gummi) ? $node->fav_gummi : 0,
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'#title' => t('Do they like gummi bears?'),
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);
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// Color and number, page 3
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$form['fav_color'] = array(
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'#type' => 'select',
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'#title' => t('Favorite color'),
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'#default_value' => isset($node->fav_color) ? $node->fav_color : 'red',
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'#options' => array('red' => t('Red'), 'green' => t('Green'), 'blue' => t('Blue'), 'yellow' => t('Yellow')),
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'#required' => TRUE,
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);
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$form['fav_number'] = array(
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'#type' => 'textfield',
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'#title' => t('Favorite number'),
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'#default_value' => isset($node->fav_number) ? $node->fav_number : NULL,
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'#required' => TRUE,
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);
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// Movie and tv show, page 4
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$form['fav_movie'] = array(
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'#type' => 'textfield',
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'#title' => t('Favorite movie'),
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'#default_value' => isset($node->fav_movie) ? $node->fav_movie : NULL,
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'#required' => TRUE,
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);
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$form['fav_tv'] = array(
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'#type' => 'radios',
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'#title' => t('How often do you watch your favorite tv show?'),
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'#default_value' => isset($node->fav_tv) ? $node->fav_tv : 'daily',
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'#options' => array('daily' => t('Daily'), 'weekly' => t('Weekly'), 'monthly' => t('Monthly'),),
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'#required' => TRUE,
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);
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// Some markup elements to help the user see what they've already
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// entered. Since the data won't be available until after the form
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// is submitted, we'll only build the basic element here, and then
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// we'll populate it in #pre_render
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$form['person_display'] = array(
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'#type' => 'markup',
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);
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$form['color_number_display'] = array(
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'#type' => 'markup',
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);
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// Add a back button
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$form['back'] = array(
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'#type' => 'button',
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'#value' => t('Back'),
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'#weight' => 35,
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);
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return $form;
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}
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function theme_multipage_form_example_node_form($form) {
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$content = '';
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if (in_array($form['page']['#value'], array(3,4))) {
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$content .= '<p>'. t('Your favorite person is %person, and they %like gummi bears.', array('%person' => check_plain($form['person']['fav_person']['#value']), '%like' => ($form['person']['fav_gummi']['#value'] ? t('like') : t('don\'t like')))) .'</p>';
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}
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if (in_array($form['page']['#value'], array(4))) {
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$content .= '<p>'. t('Your favorite color is %color, and your favorite number is %number.', array('%color' => check_plain($form['fav_color']['#value']), '%number' => check_plain($form['fav_number']['#value'])));
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}
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foreach (element_children($form) as $key) {
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$content .= form_render($form[$key]);
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}
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return $content;
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}
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/**
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* Implementation of hook_form_alter(). Here, we set up the 'page' field,
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* which keeps track of what stage the form is in.
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*/
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function multipage_form_example_form_alter($form_id, &$form) {
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// Make sure it's our multipage form.
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if ($form_id == 'multipage_form_example_node_form') {
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// Determine which page of the multipage form we're on. We don't do
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// any incrementing here - that's something that our #pre_render'er
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// will do when this page of the form has successfully validated.
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$form['page'] = array(
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'#type' => 'hidden',
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'#value' => isset($_POST['edit']['page']) ? $_POST['edit']['page'] : 1,
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);
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// If back button is pressed, back up the form stage, Also, if preview
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// is hit we need to decrement the counter here to keep us on the same page.
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if ($_POST['op'] == t('Back')) {
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$form['page']['#value']--;
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}
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// This modifies the form for validation purposes. once validation is
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// completed, it'll be called one more time (through Drupal's Form API)
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// at which point it'll advance the form to the next page.
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multipage_form_example_pre_render($form_id, $form, FALSE);
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// Here we're augmenting the regular node form validation/submission with
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// some of our own. Note that these are inside the conditional check for
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// this particular form.
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$form['#validate'] = array_merge($form['#validate'], array('multipage_form_example_custom_validate' => array()));
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$form['#submit'] = array_merge($form['#submit'], array('multipage_form_example_custom_submit' => array()));
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}
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return $form;
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}
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/**
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* Validate our form.
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*/
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function multipage_form_example_custom_validate() {
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global $form_values;
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// validate our number, but don't bother if the back button was hit
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if (($form_values['page'] == 3 ) && !is_numeric($form_values['fav_number']) && ($_POST['op'] != t('Back'))) {
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form_set_error('fav_number', t('Favorite number is a <em>number</em>, dummy!'));
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}
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}
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/**
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* The #pre_render of a form allows us to make changes AFTER validation (unlike
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* hook_form_alter()), but BEFORE the form has actually been displayed. We use
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* it to control which form elements are shown, which are hidden, and which values
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* to set based on validate elements, not $_POST. This is a necessity for our
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* complicated multipage example form.
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*/
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function multipage_form_example_pre_render($form_id, &$form, $next_page = TRUE) {
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global $form_values;
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// Make sure it's our multipage form.
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if ($form_id == 'multipage_form_example_node_form') {
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// Are we ready for the next page in our form?
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if ($next_page && isset($_POST['edit']['page']) && ($_POST['op'] != t('Back')) && ($_POST['op'] != t('Preview'))) {
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$form['page']['#value'] = $form['page']['#value'] + 1;
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}
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// Validation errors? Show previous page for correcting.
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if (form_get_errors()) {
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$form['page']['#value']--;
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}
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// Modify the #required/#type values depending on our current page.
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// The arrays tell us the pages the changes should take place in.
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// Title/body, stage 1
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multipage_form_set_element_visibility($form['title'], in_array($form['page']['#value'], array(1)));
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multipage_form_set_element_visibility($form['body'], in_array($form['page']['#value'], array(1)));
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// Person, stage 2
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multipage_form_set_element_visibility($form['person'], in_array($form['page']['#value'], array(2)));
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multipage_form_set_element_visibility($form['person']['fav_person'], in_array($form['page']['#value'], array(2)));
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multipage_form_set_element_visibility($form['person']['fav_person_desc'], in_array($form['page']['#value'], array(2)));
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multipage_form_set_element_visibility($form['person']['fav_gummi'], in_array($form['page']['#value'], array(2)), $next_page);
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// Color and number, page 3
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multipage_form_set_element_visibility($form['fav_color'], in_array($form['page']['#value'], array(3)));
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multipage_form_set_element_visibility($form['fav_number'], in_array($form['page']['#value'], array(3)));
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// Movie and tv show, page 4
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multipage_form_set_element_visibility($form['fav_movie'], in_array($form['page']['#value'], array(4)));
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// This bit of trickery is because radios is a bit of a special case --
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// it's an 'expanding' form element, which means that the multiple buttons
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// get built by form_builder. Because the building for display actually
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// happens when the form is still set to stage 3, we have to build it as a
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// radios type in stage 3, or nothing will display on stage 4!
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// form_hide_elements is a little helper function that recurses through and
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// hides all of the buttons we built if we don't actually happen to be
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// displaying stage 4. whew!
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if ($next_page) {
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multipage_form_set_element_visibility($form['fav_tv'], in_array($form['page']['#value'], array(4)));
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}
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// Buttons -- like radios, they need to be properly built in the previous stage, so here we also do the switches at
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// the last chance we have. Notice that the type gets set to 'value' and not 'hidden', b/c hidden will screw w/
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// $_POST['op']
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if ($next_page) {
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multipage_form_set_element_visibility($form['back'], in_array($form['page']['#value'], array(2, 3, 4)));
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multipage_form_set_element_visibility($form['preview'], in_array($form['page']['#value'], array(4)));
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multipage_form_set_element_visibility($form['submit'], in_array($form['page']['#value'], array(4)));
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$submit_text = array(NULL, t('Next (person)'), t('Next (color/number)'), t('Next (tv/movie)'), t('Submit'));
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$form['submit']['#value'] = $submit_text[$form['page']['#value']];
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}
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}
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}
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// Handles form submission. We're just throwing our data into the variable
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// table to keep things simple
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function multipage_form_example_custom_submit() {
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global $form_values;
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foreach ($form_values as $key => $value) {
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if (in_array($key, array('fav_person', 'fav_person_desc', 'fav_gummi', 'fav_color', 'fav_number', 'fav_movie', 'fav_tv',))) {
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$array[$key] = $value;
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}
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}
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// A little hack so we can save new node info properly to the variable table
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if (isset($form_values['nid'])) {
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$nid = $form_values['nid'];
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}
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else {
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$nid = db_result(db_query("SELECT id FROM {sequences} WHERE name = 'node_nid'"));
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}
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variable_set('multipage_form_example_'. $nid, $array);
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}
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/**
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* Implementation of hook_load().
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*
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* Now that we've defined how to manage the node data in the database, We
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* need to tell Drupal how to get the node back out. This hook is called
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* every time a node is loaded, and allows us to do some loading of our own.
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*/
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function multipage_form_example_load($node) {
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$additions = variable_get('multipage_form_example_'. $node->nid, NULL);
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$additions = (object) $additions;
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return $additions;
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}
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/**
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* Implementation of hook_delete().
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*
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* Clean up our data in variable table.
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*/
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function multipage_form_example_delete($node) {
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// Notice that we're matching all revision, by using the node's nid.
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variable_del('multipage_form_example_'. $node->nid);
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}
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/**
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* Implementation of hook_view().
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*
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* This is a typical implementation that simply runs the node text through
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* the output filters.
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*/
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function multipage_form_example_view(&$node, $teaser = FALSE, $page = FALSE) {
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$node = node_prepare($node, $teaser);
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$favorites = theme('multipage_form_example', $node);
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$node->body .= $favorites;
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$node->teaser .= $favorites;
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}
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/**
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* A custom theme function.
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*
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* By using this function to format our node-specific information, themes
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* can override this presentation if they wish. We also wrap the default
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* presentation in a CSS class that is prefixed by the module name. This
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* way, style sheets can modify the output without requiring theme code.
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*/
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function theme_multipage_form_example($node) {
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$person_display = t('Your favorite person is %person, and they %like gummi bears. <br \>', array('%person' => check_plain($node->fav_person), '%like' => ($node->fav_gummi ? t('like') : t('don\'t like'))));
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$color_number_display = t('Your favorite color is %color, and your favorite number is %number. <br \>', array('%color' => check_plain($node->fav_color), '%number' => check_plain($node->fav_number)));
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$tv_movie_display = t('Your favorite movie is %movie, and you watch your favorite tv show %watch.', array('%movie' => check_plain($node->fav_movie), '%watch' => check_plain($node->fav_tv)));
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$output = '<div class="multipage_form_example">';
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$output .= $person_display . $color_number_display . $tv_movie_display;
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$output .= '</div>';
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return $output;
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}
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/**
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* Set an element's visibility. Elements are gnerally changed to hidden
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* elements. Visibility may be set and reset any number of times.
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*
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* @param $element
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* The form element array to modify.
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* @param $visible
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* The desired visibity of the form element.
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* @param $next_page
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* Boolean value, TRUE if the next page is about to be rendered, FALSE otherwise.
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*/
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function multipage_form_set_element_visibility(&$element, $visible, $next_page = TRUE) {
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multipage_form_restore_attributes($element);
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if (!$visible) {
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switch ($element['#type']) {
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case 'textfield':
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case 'textarea':
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case 'radios':
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case 'select':
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multipage_form_set_attribute($element, '#type', 'hidden');
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multipage_form_set_attribute($element, '#required', FALSE);
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break;
|
| 401 |
|
| 402 |
case 'radio':
|
| 403 |
case 'checkbox':
|
| 404 |
|
| 405 |
// We can't change these to hidden until right before the next page is rendered, otherwise
|
| 406 |
// the value is lost sometimes.
|
| 407 |
if ($next_page) {
|
| 408 |
multipage_form_set_attribute($element, '#type', 'hidden');
|
| 409 |
}
|
| 410 |
break;
|
| 411 |
|
| 412 |
case 'fieldset':
|
| 413 |
multipage_form_set_attribute($element, '#type', NULL);
|
| 414 |
break;
|
| 415 |
|
| 416 |
case 'button':
|
| 417 |
multipage_form_set_attribute($element, '#type', 'value');
|
| 418 |
break;
|
| 419 |
|
| 420 |
case 'submit':
|
| 421 |
multipage_form_set_attribute($element, '#type', 'button');
|
| 422 |
break;
|
| 423 |
}
|
| 424 |
}
|
| 425 |
|
| 426 |
foreach (element_children($element) as $key) {
|
| 427 |
multipage_form_set_element_visibility($element[$key], $visible);
|
| 428 |
}
|
| 429 |
}
|
| 430 |
|
| 431 |
/**
|
| 432 |
* Set an attribute on an element array with storing the previous value which
|
| 433 |
* may be reverted to using multipage_form_restore_attributes().
|
| 434 |
*
|
| 435 |
* @param $element
|
| 436 |
* The form element array to modify.
|
| 437 |
* @param $key
|
| 438 |
* A key of the form element array.
|
| 439 |
* @param $new_value
|
| 440 |
* The new value for the attribute.
|
| 441 |
*/
|
| 442 |
function multipage_form_set_attribute(&$element, $key, $new_value) {
|
| 443 |
$element['#multipage_form_original_'. $key] = $element[$key];
|
| 444 |
$element[$key] = $new_value;
|
| 445 |
}
|
| 446 |
|
| 447 |
/**
|
| 448 |
* Restore any form attributes which have been set using
|
| 449 |
* multipage_form_set_attribute().
|
| 450 |
*
|
| 451 |
* @param $element
|
| 452 |
* The form element array to restore.
|
| 453 |
*/
|
| 454 |
function multipage_form_restore_attributes(&$element) {
|
| 455 |
foreach (array_filter(array_keys($element), create_function('$key', 'return (strpos($key, "#multipage_form_original_") === 0);')) as $key) {
|
| 456 |
$element[str_replace('#multipage_form_original_', '', $key)] = $element[$key];
|
| 457 |
}
|
| 458 |
}
|
| 459 |
|
| 460 |
/**
|
| 461 |
* Playing around here with a new form element to enable storing hidden values in an array fashion.
|
| 462 |
* Seems to work fine. Check out $form['test_hidden_array'] above for how to structure the form
|
| 463 |
* element
|
| 464 |
*/
|
| 465 |
function multipage_form_example_elements() {
|
| 466 |
$type['hidden_array'] = array('#input' => TRUE, '#process' => array('expand_hidden_array' => array()), '#tree' => TRUE);
|
| 467 |
return $type;
|
| 468 |
}
|
| 469 |
|
| 470 |
function expand_hidden_array($element) {
|
| 471 |
$values = is_array($element['#values']) ? $element['#values'] : array();
|
| 472 |
$element['#tree'] = TRUE;
|
| 473 |
foreach ($values as $key => $value) {
|
| 474 |
$element[$key] = array('#type' => 'hidden', '#processed' => TRUE, '#value' => $value);
|
| 475 |
}
|
| 476 |
return $element;
|
| 477 |
}
|
| 478 |
|
| 479 |
function theme_hidden_array($element) {
|
| 480 |
return $element['#children'];
|
| 481 |
}
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